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FIS Finland Finland International Sehool, Thane 2023-2024 Inlonatioal Second Preliminary Examination Grade: N Subjeet: Physiex Date: 2hd February, 2024 Marks: 80 Number of sides: 7 Writing time: 2 hours Answers to this Paper must be writen on the paper provided separately. You will not be allowed towrite during first 15 minutes. This time is to be spent in reading the question paper. The time given at the head of this Paper ix the time allowed for writing the answers. Secrion Ais compulsory. Atempt any four questions from Section B. The intended marks for questions or partx of questions are given in brackets |). Section A |40 Marksl |Attempt allquestions from this section) Question t Choose the correct answer from theoptions given below: [1S] () The diagram below shows an image tormed at adistance 36 enm from the lens LL' of focal length 12 cm. With respect to this answer the questions that follow. 2F The object distance with sign convention is (b) -15 cm (a) -18 cm (c) 9 cm (d) +18 cm cycle (i) A girl at rest at gate of her society which is 3,2 m above the road comes down the slope AB on a without paddling. (g- 10 NKg) 3.2 c The mechanicalenergy possessed by the girl at B is: (a) Vibrational kinetic energy (b) Translational kinetic energy (c) Elastic potential energy () Gravitational potential energy which is 3.2 mabove the road comes (m) Agirl at rest at gate of her society down the slope AB on a cycle without pgddling. (g = 10 N/Kg) B 3.2 cm The velocity with which girl reaches point A is (b) 10 m/s (a) 32 m/s (d) Insufficient infornmation to calculate velocity. (c) 8 m/s prism of critical angle 42:. (iv) The diagram shows the path of light through a right-angled follow: Observe the diagram and answer the questions that A The phenomenon at the surface AC is (b) Partial reflection (a) Refraction (c) Total internal reflection (d) Scattering (v) A lottery of mass 4000 Kg is travelling at a speed of 4.0 m/s. A car has a mass of 1000 Kg. The kinetic energy of the car is equal to the kinetic energy of the lorry. Find h velocity (a) 2.0 m/s (c) 8.0 m/s (vi) me car (b) 4.0m/s (d) 16.0 m/s A force acts on an object and causes the object to move a certain distance, in the same direction as the force. Which row represents a situation in which the largest amount of work is done on the object by the force? force/N distance moved/m (a) 2.0 40.0 (b) 10.0 2.0 (c) 20.0 6.0 (d) 100.0 L.0 (vi ) Astone of mass mis held at rest in water. The stone is released and falls vertically at distance h. The stone reaches a sped v. Some of the original energy of the stone is transferred to the water. As it falls, resistive forces cause the temperature of the water and stone to increase. Which expression gives the work done against the resistive forces? 1 () m' (b) mghmv (c) mgh (d) mgh +2 my' (vi)) Which energy resources do not derive their energy from the Sun? (a) geothermal (b) hydroclectric (c) oil (d) waves (ix) Some processes are more efficient than others: Which expression gives the efficiency of a process? total energy output (a) total energy input X 100% (b) (c) useful energy output X 100% total energy input wasted energy output (d) X 100% total energy input wasted energy output useful energy input X 100% through a vertical height of 2.0 m in 0.80 s (x) A weight lifter raises a 2000 N weight What useful power does he develop in doing this? (b) 3200 W (a) 800 W (c) 4000 W (d) 5000 W hear the sound from frequency of 10000 Hz. The boy's friend cannot (xi) A boy blows a whistle that has a hear the sound? cannot could be a reason why he the whistle. The friend has normal hearing. What (a) (b) (c) (d) The amplitude is too large The amplitude is too small The frequency is too high The frequency is too low An engineer adjusts the alarm so that it (xii) A fire alarm is not loud enough and the pitch is too low. this have on the amplitude and on the produces a louder note of a higher pitch. What effect does frequency of the sound waves that the alarm produces? amplitude frequency (a) larger larger (b) (c) larger smaller (d) smaller larger smaller smaller wall. (xiii) A student claps once when standing 100 m away from a large does the student hear an echo? clapping The speed of sound in air is 330 m/s. How long after (a) 0.3 s (c) 1.7 s (b) 0.61 s (d) 3.3 s 3 (xiv) White light enters a glass prism. The light leaving the other side of the prism is separated into colours. Glass prism White light Colour 1 . Colour 2 diagram 1 Glass prism White light Colour 1 Colour 2 diagram 2 Which row correctly describes what happens? path taken by the light colour l colour 2 red violet violet red red violet violet red diagram 1 diagram 1 diagram 2 diagram 2 (a (b) (c) (d) (xv) The diagram shows the electromagnetic spectrum, in order of increasing wavelength. Three types of radiation P, Q and R are missing from the spectrum diagram. Y - rays X-rays P visible light microwaves R Which types of electromagnetic radiation are represented by P, by Q and by R? P R (a) infra-red (b) (c) infra-red ultraviolet infra-red radio waves (d ultraviolet waves infra-red waves ultraviolet ultravioletradio waves Question 2 (a) (i) Name the phenomenon involved in tuning aradio set to aparticular station. (i) Define the phenomenon named by you in part (i) above (i) What do you understand about the loudness of sound? [3) (b) (i) Define moment of force. (i) Write the relationship between the SI and CGS units of moment of force. (c) Define a kilowatt-hour. How it is related to joule? [2] [2] (d) A satellite revolves around a planet in a circular orbit. What is the work done by instant? Give a reason. the satellite at any (e) A crane 'A' lifts a heavyload in 5 seconds whereas another crane 'B' does the same work (2)in 2 seconds. Compare the power of crane A' to that of crane `B (2] () Aray of light falls normally on a rectan gular glass slab. Draw a ray diagram showing the path ray till it emerges out of the of the slab. (2] (g) Complete the path of the monochromatic light ray AB incident on the surface PQ of the equilateral glass prism PQR till it emerges out of the prism due to refraction. [2] Question 3 (a) Where should an object be placed in front of a convex lens in order to get: (i) An enlarged real image? (ii) enlarged virtual image? [2] 4 (b) A pond appearS to be 2.7 m deep. If the refractive index of water is 3 , find the actual depth of the pond. [2] (c) The wavelengths for the light of red and blue colours are nearly 7.8 x 10 m and 4.8 x 10 m respectively. [2] (i) Which colour has the greater speed in a vacuum? (ii) Which colour has a greater speed in glass? (d) Drawa graph between displacement from mean position and time for a body executing free vibration in a vacuum. [2] (e) A sound wave travelling in water has (The speed of sound in water= 1400 ms).wavelengths 0.4m. Is this wave audible in air? [2] Section B40 marks) [Atempt any four out of six] Question 4 (a) Calculate the total resistance across AB: 32 (3] 50 A 60 (b) Two metallic blocks P and Q having masses in the ratio 2:1 are supplied with the same amount of heat. If their temperatures rise by the same degree, compare their specific hear capacities. (3] (c) Explain with the help of a diagram the of a stick immersed in water. appearance (4] Question 5 (a) The figure below shows a simple pendulum of 200 g mass. It is displaced from the mean position A to the extreme position B. The potential energy at the A iszero. At the position B, the position bob is raised by 5 m. pendulum (3] B () What is the potential energy of the pendulum at the position B? (i)What is the total mechanical energy at point C? (in) What is the speed of the bob at the position Awhen released from B? (b) (0) Why docs astone lying in the sun get heated up much more than water lying for the same duration of time? (ii) Why is it not advisable to use a piece of copper wire as fuse wirc in an clectric circuit? (3] (c) A block and tackle system of pulleys has a velocity ratio if4. [4) () Draw a neat labelled diagram of the system indicating clearly the points of application and direction of load and effort. (ii) What will be its V.R if the weight of the movable block is doubled? Question6 (a) A diver in water looks obliquely at an object AB in air. air (3] A C D water Eye of the diver (i) Does the object appear taller, shorter or of the same size to the diver? (ii) Show the path of the two rays AC and AD start ng from the tip of the object as it travels towards the diver in water and hence obtain the image of the object. (b) Complete the path of the ray AB through the glass prism in PQR till it emerges out of the prisrn. Given the critical angle of the glass as 42. [3] (c) A lens of 20 cm focal length forms an inverted image at a distance of 60 cm from the lens. [4] (i) Identify the lens. (i ) How far is the lens present in front of the object? (iii) Calculate the magnification of the image. Question 7 (a) The V-I graph for a series combination and for a parallel figure below. Which of the two A or B represents the parallelcombination of two resistors is shown in the combination? Give a reason for your answer. [3] B X (b) (i) Name the system which enables us to locate underwater objects by transmitting ultrasonic waves and deflecting the reflecting impulse. (ii) What are acoustically measurable quantities related to pitch and loudness? [3] (c) (i) When a tuning fork (vibrating) is held close to the ear, one hears a hum. If the same (vibrating tuning fork) is held such that its stem is in contact with the table surface,faint then one hears a loud sound. Explain. 6 (ii) A man standing in front of a vertical cliff a gun, He hears the echo after 3.5 seconds. On moving closer to the cliff by 84 m, he hears thefires echo 3 after seconds. Calculate the distance of the cliff from the initial position of the man. (4) Question 8 (a) (i) Which particles are responsible for in conductors? (11) To which wire of a cable in a powcrcurrent circuit should the metal case of a geyser be (iii) To which wire should the connected? fuse be connected? (b)(i) Differentiate between nuclear fusion and fission. (i) State one safety precaution in the disposalnuclear of nuclear waste. (c) (3] (3] 10 V 30 K 1.00 30 In the circuit shown, find the reading of the ammeter A when the key K is () open (ii) closed [4) Question 9 (a) (i) Define heat capacity ofa substance. [3] (i ) Write the SI unit if heat capacity. (iii) What is the relationship between heat capacity and specific heat capacity of a substance? (b) The diagram below shows the change of phases of a substance on a temperature vs time graph on heating the substance at a constant rate. temp c F D t2 t E/ B time (S) (i) Why is the slope of CD less than the slope of AB? (ii) What is the boiling point and melting point of the substance? (3] (c) Apiece of ice of 60 g mass is dropped into 140g of water at 50 C. Calculate the final temperature of water when all the ice has melted. (Assume no heat is lost to the surrounding). [4) Specific heat capacity of water =4.2 Jg'K Specific latent heat of fusion of ice =336 Jg 7
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